I use the SMS Plugin:
What I REALLY want to do is, instead of logging into my control panel and having to type up a message in the admin control panel of this plugin is - when I create a new post to a specific category it then sends a SMS message to all registered users with the content of that post - (or probably just the excerpt to deal with SMS character limits). [Basically so I don't have to do the same action twice]
Any ideas on this??